Souisa, Matheus, Lilik Hendrajaya, and Gunawan Handayani. 2018. “Study on Estimates of Travel Distance, Velocity and Potential Volume of Amahusu Sliding Plane Using Energy Conservation Approach in Conjunction With Geoelectric Survey”. Journal of Mathematical and Fundamental Sciences 50 (2):166-81. https://doi.org/10.5614/j.math.fund.sci.2018.50.2.5.